Strange Error Message with Imported Function

[supercooldave]

The following code (which uses a new module, but I'm sure the bug applies to other modules):

import Data.Char

active class Main
  def main() : unit
    isdigit()
    -- should be isdigit('A')
  end
end

results in the odd error message:

 *** Error during typechecking *** 
"Bug.enc" (line 5, column 5)
Unknown namespace Data.Char
In expression: 
  isdigit()
In method 'main' of type 'unit'
In class 'Main

The problem is not that the namespace is unknown, but that the function is not provided with the correct number of arguments.

[EliasC]

I think this is related to recently added support for default parameters. The same error appears even if the function is in the same module (but with an "empty" unknown namespace).